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pt having alveolar PCO2 40 mmHg ,begins to hyperventilate.If his alveolar ventilation quadruples and CO2 production remains constant ,what will be the alveolar PCO2 ?


:arrow: alveolar CO2 =10 since Pa CO2 = CO2 produced/ Alveolar ventilation .


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it is really problem . I can not understood this question at all please explain it in details.
Thank you


10 mm hg..


If CO2 production did not increase, and only ventilation increased 4 times then alveolar CO2 must decrease by 4 times, cuz it is in equib with arteriolar CO2 which is being reduced by increased ventilation, leading to acute Resp Alk.

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